128 samples with node denoiser animation still flickering
I played with light bounces, clamping, filter glossy and caustics settings and I tried to set it to the min possible value without loosing too many details; this have reduced a little bit the noise but still looked so bad.

Then I found a tutorial on youtube, so I removed the neons objects with emission shader and replace it with area lights, with this I've almost removed all the noise

Then I tried to switch from Path Tracing integrator sampling to the Branched Path Tracing and this completly removed almost all noise but increase a lot time render (from 3.00min to 15.00min)

So I tried to decrease the samples number (from 128 to 32) to decrease the time rendering, this added more noise but still look good

Now I will play with settings to adjust it more and increase details and then try to add a denoise node.